Calibration of Thickness Measurement Instruments Based on Twin Laser Sensors. Isolines Bilinear Look Up Tables

摘要

In this report we will present a procedure for the calibration of an instrument for non-contact thickness measurement of stainless steel sheets, based on a pair of Triangulation Laser Sensors [1]. First of all we will carry out a general review of the architecture of this kind of instruments and of the problems associated with non-contact measurement based on commercial laser sensors in an industrial production environment. Secondly will we introduce a method for the calibration and characterization of this instrument based on the piecewise linear approximation of the isoline curves obtained in the calibration process (isoline bilinear look-up tables). We will follow with a description of the searching and calculation of thickness in these types of tables.